Portable gravel-heater



2 Sheets-Sheet 2.

(No Model.)

A. STENGER. PORTABLE GEAVEL HEATER.

. Patented N0v.26, 1895.

MNEEEEE Q5/af. W yf y UNITED STATES PATENT OFFICE.

ANDREV STENGER, OF BROOKLYN, NEV YORK.

PORTABLE G RAVEL-H EATER.

SPECIFICATION forming part of Letters Patent No. 550,461, dated November26, 1895.

Appuoooioo fiioa ootobor 29, 1894. soria No. 527,284. (No moaol.)

To all whom it may concern:

Be it known that LANDEEW STENGER,a citizen of the United States,residing at Brooklyn, county of Kings, State of New York, have inventedcertain new and useful Improvements in Portable Grit, Sand, and GravelHeating Machines, of which the following is a specication.

The object of my invention is to provide a machine for drying gravel foruse more particularly in laying roadways or filling in the Spacesbetween Belgian or other paving blocks.

The invention consists in the novel details of improvement and thecombinations of parts that will be more fully hereinafter set forth, andthen pointed out in the claim.

Reference is to be had to the accompanying drawings, forming part ofthis specification, wherein- Figure 1 is a perspective view of myimproved gravel-heating machine, and Fig. 2 is a vertical cross-sectionthereof.

In the accompanying drawings, the letter A indicates a suitable casingor receptacle,

preferably made of sheet metal, and which may be mounted on rollers a topermit it to be transported. The casing or receptacle A is provided witha shelf or partition B, which is preferably inclined toward the front ofthe casing, and beneath said shelf or partition is a combustion-chamberD, (which heats the products in a very short time,) having gratebars b.

E are smoke pipes or flues that open through the partition B into thechamber D and pass up through the casing A to carry oif the smoke andheated products of combustion from the fire in the chamber D.

The side or front of the casingA is provided with one or more openingsCZ in line with the lower edge of the partition or shelf B, so that thegravel can slide through said openings. Said openings are provided withdoors or covers e, that preferably fit in guides f, so that they may beraised to permit the gravel to slide out of the casing.

g are draft-openings to admit air to the combustion-chamber D.

e2 are chutes to carry the gravel from the openings d.

The casing A is provided on top with a cover F, preferably having astationary portion h and hinged portions c', to permit the gravel to beplaced in the casing, the stationary portion acting to hold the flue orpipe E.

Dfa is a door at the back of the combustionchamber D to permit fuel tobe placed in said chamber.

In operation the gravel to be heated and dried is shoveled into thecasing through the top and the cover partially closed. A fire beingbuilt in the combustion-chamberD heats the partition B and the gravel Grthereon and the heat and heated products of combustion pass up throughthe flues E, heating the gravel that surrounds them. By this means themoisture that accompanied the gravel is dried out, and as the gravel atthe lower part of the machine is dried it may be removed through theopenings CZ, while new gravel is placed on the top, thus keeping up acontinuous operation of drying and heating Athe gravel withoutinterruption. By this means it is not necessary to completely dry theentire quantity of gravelbefore any of it can be used, but it can bedried and removed gradually. By this means time and labor are saved, asit is not necessary to shovel the dried gravel from the machine, becauseit will pass by gravity out of the openings d.

Having thus described my invention, the following is what I claim as newtherein and desire to secure by Letters Patent:

A portable sand and` gravel drier comprising a casing, having a suitablecover, divided by the single inclined partition and extending from frontto back, into a drying chamber, and a combustion chamber beneath thedrying chamber; said combustion chamber having a smoke outlet formed bya pipe secured at its lower end in the inclined partition and extendingcentrally upward through

